diff options
Diffstat (limited to 'copy.c')
| -rw-r--r-- | copy.c | 61 |
1 files changed, 61 insertions, 0 deletions
@@ -1,6 +1,9 @@ #include "git-compat-util.h" #include "copy.h" #include "path.h" +#include "gettext.h" +#include "strbuf.h" +#include "abspath.h" int copy_fd(int ifd, int ofd) { @@ -67,3 +70,61 @@ int copy_file_with_time(const char *dst, const char *src, int mode) return copy_times(dst, src); return status; } + +static int do_symlinks_match(const char *path1, const char *path2) +{ + struct strbuf buf1 = STRBUF_INIT, buf2 = STRBUF_INIT; + int ret = 0; + + if (!strbuf_readlink(&buf1, path1, 0) && + !strbuf_readlink(&buf2, path2, 0)) + ret = !strcmp(buf1.buf, buf2.buf); + + strbuf_release(&buf1); + strbuf_release(&buf2); + return ret; +} + +int do_files_match(const char *path1, const char *path2) +{ + struct stat st1, st2; + int fd1 = -1, fd2 = -1, ret = 1; + char buf1[8192], buf2[8192]; + + if ((fd1 = open_nofollow(path1, O_RDONLY)) < 0 || + fstat(fd1, &st1) || !S_ISREG(st1.st_mode)) { + if (fd1 < 0 && errno == ELOOP) + /* maybe this is a symbolic link? */ + return do_symlinks_match(path1, path2); + ret = 0; + } else if ((fd2 = open_nofollow(path2, O_RDONLY)) < 0 || + fstat(fd2, &st2) || !S_ISREG(st2.st_mode)) { + ret = 0; + } + + if (ret) + /* to match, neither must be executable, or both */ + ret = !(st1.st_mode & 0111) == !(st2.st_mode & 0111); + + if (ret) + ret = st1.st_size == st2.st_size; + + while (ret) { + ssize_t len1 = read_in_full(fd1, buf1, sizeof(buf1)); + ssize_t len2 = read_in_full(fd2, buf2, sizeof(buf2)); + + if (len1 < 0 || len2 < 0 || len1 != len2) + ret = 0; /* read error or different file size */ + else if (!len1) /* len2 is also 0; hit EOF on both */ + break; /* ret is still true */ + else + ret = !memcmp(buf1, buf2, len1); + } + + if (fd1 >= 0) + close(fd1); + if (fd2 >= 0) + close(fd2); + + return ret; +} |